Re: Running a 305 with '747

["Jeff Flanary" <jefff@mounet.com>]

The Prom & Calpak i'm using is from an 88 model.
Jeff
----- Original Message -----
From: "Kurek, Larry" <lkurek@anl.gov>
To: <gmecm@diy-efi.org>
Sent: Monday, May 01, 2000 5:49 PM
Subject: RE: Running a 305 with '747


> What year truck had both TBI and a 305 and used a 747 type ECM? I thought
> injection was added to the truck lines in 1987, and the only small block
> engine available was the 350. Yes? No?
>
> Larry
>
> > Correct me if i'm wrong, but i used a 747 from a 4.3 astro in
> > my S10 w/305
> > TBI, all i did was put a 305 TBI prom from a fullsize truck, and got a
> > calpak from the same and put it in the ecm.  It runs fine.  Jeff
> >
> >
> > ----- Original Message -----
> > From: "Kurek, Larry" <lkurek@anl.gov>
> > To: <gmecm@diy-efi.org>
> > Sent: Monday, May 01, 2000 3:04 PM
> > Subject: Running a 305 with '747
> >
> >
> > > All:
> > >
> > > I am considering swapping a 305 motor into my 87 Astro van.
> > It currently
> > has
> > > a 4.3 TBI setup on it, and I am debating what system to run
> > on the 305. It
> > > currently has a TPI setup on it, but I don't feel like
> > wasting that system
> > > on a minivan :)  So...I have a complete TBI setup off a
> > 1500 truck (747),
> > > which as I can see...is pretty much plug and play with the
> > Astro wiring
> > > harness (granted, a couple of repins...but no biggie). The
> > biggest thing I
> > > see, is recalibrating everything to run as an 8cyl vs a 6.
> > Easiest thing
> > > here is to run the 747 ECM rather than the Astro's.
> > However, the 747 is
> > > calibrated for a 350. What, if anything, should I do to run
> > this on a 305?
> > I
> > > know the ECM will "learn" through O2 feedback, however I'd
> > rather start
> > with
> > > a decent calibration that was relatively close to begin with. I was
> > > considering: A new PROM with a modified cylinder size
> > (easiest?); or a
> > > ECM/PROM/Cal from a 305 TBI engine (Know of any that would
> > be useful?).
> > >
> > > Any help much appreciated :)
> > >
> > > Larry
> > >
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